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https://sources.debian.org/src/vtk7/7.1.1%2Bdfsg2-10.1/debian/patches/.

--- a/CMake/VTKGenerateExportHeader.cmake
+++ b/CMake/VTKGenerateExportHeader.cmake
@@ -174,7 +174,7 @@
     execute_process(COMMAND ${CMAKE_C_COMPILER} --version
       OUTPUT_VARIABLE _gcc_version_info
       ERROR_VARIABLE _gcc_version_info)
-    string(REGEX MATCH "[3-9]\\.[0-9]\\.[0-9]*"
+    string(REGEX MATCH "[0-9]*\\.[0-9]\\.[0-9]*"
       _gcc_version "${_gcc_version_info}")
     # gcc on mac just reports: "gcc (GCC) 3.3 20030304 ..." without the
     # patch level, handle this here: